Removing an old/invalid license from eLicenser

I’ve read on other posts that it’s not possible to remove a license, only transfer them. That’s fine, but what about licenses that are no longer valid? Nexus2 had an upgrade to Nexus3 lately and they no longer use the eLicenser as a result to this upgrade.

I’m really anal about keeping things tidy so any help would be greatly appreciated in the removal of the unused license from the eLicenser.

Thank you